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- W2106507501 abstract "A near-field Cassegrain reflector (NFCR) is an effective way to magnify a small phased array into a much larger aperture antenna for limited scan applications. Traditionally the pattern wave approach, i.e. the field from the feed array incident on the subreflector is approximated by a truncated collimated beam with planar phase and tapered amplitude distribution. This approach simplifies the computation tremendously, but fails to provide design information about the most critical component of the whole antenna system, namely, the feed array. With the help of today's computers, it is now feasible to calculate the pattern of a NFCR by a more exact element-by-element approach. Each element in the feed array is considered individually and the diffraction pattern from the subreflector is calculated by the geometrical theory of diffraction (GTD). The field contributions from all elements are superimposed at the curved main reflector surface, and a physical optics integration is performed to obtain the secondary pattern. >" @default.
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- W2106507501 date "1990-07-01" @default.
- W2106507501 modified "2023-09-23" @default.
- W2106507501 title "Analysis of near-field Cassegrain reflector: plane wave versus element-by-element approach" @default.
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- W2106507501 doi "https://doi.org/10.1109/8.55612" @default.
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